AP explains that 4/20 grew from humble roots to high holiday

4/20 grew from humble roots to marijuana's high holiday. Marijuana advocates are gearing up for April 20. April 20 is a marijuana-legal day for adults to take part in the celebration of the drug's legalization. The holiday is a celebration of pot smoking and marijuana-related use.

4/20 is marijuana's high holiday on Saturday. It is often marked by large crowds gathering in parks, at festivals and at college campuses to smoke together. Marijuana advocates are gearing up for April 20, when marijuana advocates gather in parks and college campuses for the high holiday.

Thursday marks marijuana culture's high holiday, 4/20, when college students gather in clouds of smoke on campus quads. When pot shops in legal weed states thank their customers with discounts, they offer discounts. The holiday is celebrated by college students and pot shops across the U.S.